Temperature control device and method of liquid phase diffusion coefficient measuring instrument
A technology of temperature control device and liquid phase diffusion coefficient, which is applied in the field of liquid phase diffusion coefficient measurement, can solve the problems of unfavorable operation of staff due to overall temperature change, high energy consumption of temperature control, slow temperature response speed, etc., and achieve fast heating and cooling speed , High temperature control accuracy, and the effect of increasing the heating and cooling speed
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Embodiment 1
[0080] Such as Figure 5-Figure 9 As shown, the temperature control method of the liquid phase diffusion coefficient measurement system and the device heating temperature control test.
[0081] After correctly connecting the TCM digital temperature control module and the computer, set the set temperature through the control software, such as 50°C, and place the temperature probe on the side of the liquid in the stem lens. The selection of this position has been verified by experiments. The position here The temperature difference with the liquid to be tested is within ±0.05°C.
[0082]Set the TCM digital temperature control module to auto-tuning, output heating mode, the output power is large at the beginning, and the temperature rises quickly. When the temperature reaches the set temperature of 50°C, the output power gradually decreases to zero. At this time, the temperature rises slowly due to the residual heat of the heat sink. When the residual heat dissipates, the temper...
Embodiment 2
[0085] Such as Figure 5-Figure 9 As shown, the temperature control method of the liquid phase diffusion coefficient measurement system and the refrigeration temperature control test of the device. After correctly connecting the temperature control device and the computer, set the set temperature through the control software, such as 5°C, and then start to enter the automatic setting function.
[0086] The set temperature is 5°C, the TCM digital temperature control module output enters the cooling mode, and the PID automatic tuning function. The temperature drops rapidly. When the temperature reaches the set value, three fluctuations are performed near the secondary temperature, and the automatic setting is 100%. After the auto-tuning function ends, the obtained PID parameters are as follows: the PID proportional coefficient is 0.081, the PID integral time is 602.36, the differential time is 150.59, and the PID control interval is 1505 milliseconds. Since the set temperature...
Embodiment 3
[0090] Such as Figure 10-Figure 12 Shown, the measurement of the liquid phase diffusion coefficient at different temperatures. In this embodiment, the infinitely diluted diffusion coefficients of β-alanine aqueous solutions at different temperatures are taken as an example to test the temperature control method and device of the liquid phase diffusion coefficient measurement system.
[0091] Connect the temperature control device, set the temperature to be measured, let it automatically adjust first, and save the PID parameters after the adjustment is completed. After the setting is completed, the temperature control device automatically adjusts to the position type, injects the water liquid into the diffusion cell, turns on the output of the temperature device, let it cool or heat to the set temperature, let the temperature stabilize at the set value for 15-20 minutes, and then calibrate . Clean the diffusion cell, then inject 5mol / L β-alanine aqueous solution into the bot...
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